Amplitude dynamics of the charge density wave in LaTe3: Theoretical description of pump-probe experiments

Pavel E. Dolgirev, A. V. Rozhkov, Alfred Zong, Anshul Kogar, Nuh Gedik, and Boris V. Fine
Phys. Rev. B 101, 054203 – Published 12 February 2020

Abstract

We formulate a dynamical model to describe a photoinduced charge density wave (CDW) quench transition and apply it to recent multiprobe experiments on LaTe3 [A. Zong et al., Nat. Phys. 15, 27 (2019)]. Our approach relies on coupled time-dependent Ginzburg-Landau equations tracking two order parameters that represent the modulations of the electronic density and the ionic positions. We aim at describing the amplitude of the order parameters under the assumption that they are homogeneous in space. This description is supplemented by a three-temperature model, which treats separately the electronic temperature, temperature of the lattice phonons with stronger couplings to the electronic subsystem, and temperature of all other phonons. The broad scope of available data for LaTe3 and similar materials as well as the synergy between different time-resolved spectroscopies allow us to extract model parameters. The resulting calculations are in good agreement with ultrafast electron diffraction experiments, reproducing qualitative and quantitative features of the CDW amplitude evolution during the initial few picoseconds after photoexcitation.

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  • Received 25 April 2019
  • Revised 9 December 2019
  • Accepted 3 January 2020

DOI:https://doi.org/10.1103/PhysRevB.101.054203

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Pavel E. Dolgirev1,2,*, A. V. Rozhkov1,3,4,†, Alfred Zong5, Anshul Kogar5, Nuh Gedik5, and Boris V. Fine1,6,‡

  • 1Skolkovo Institute of Science and Technology, Skolkovo Innovation Center, 3 Nobel St., Moscow 143026, Russia
  • 2Department of Physics, Harvard University, Cambridge, Massachusetts, 02138, USA
  • 3Institute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences, Moscow 125412, Russia
  • 4Moscow Institute of Physics and Technology, Institutsky lane 9, Dolgoprudny, Moscow region 141700, Russia
  • 5Massachusetts Institute of Technology, Department of Physics, Cambridge, Massachusetts 02139, USA
  • 6Institute for Theoretical Physics, University of Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany

  • *p_dolgirev@g.harvard.edu
  • arozhkov@gmail.com
  • b.fine@skoltech.ru

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Issue

Vol. 101, Iss. 5 — 1 February 2020

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